This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
testjoystick.c
1
2
3
4
5
6
7
8
9
10
11
/*
Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/
12
13
14
15
16
17
18
19
20
/* Simple program to test the SDL joystick routines */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "SDL.h"
21
22
23
24
#ifdef __IPHONEOS__
#define SCREEN_WIDTH 320
#define SCREEN_HEIGHT 480
#else
25
26
#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480
29
30
void
WatchJoystick(SDL_Joystick * joystick)
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
SDL_Surface *screen;
const char *name;
int i, done;
SDL_Event event;
int x, y, draw;
SDL_Rect axis_area[6][2];
/* Set a video mode to display joystick axis position */
screen = SDL_SetVideoMode(SCREEN_WIDTH, SCREEN_HEIGHT, 16, 0);
if (screen == NULL) {
fprintf(stderr, "Couldn't set video mode: %s\n", SDL_GetError());
return;
}
/* Print info about the joystick we are watching */
name = SDL_JoystickName(SDL_JoystickIndex(joystick));
printf("Watching joystick %d: (%s)\n", SDL_JoystickIndex(joystick),
name ? name : "Unknown Joystick");
printf("Joystick has %d axes, %d hats, %d balls, and %d buttons\n",
SDL_JoystickNumAxes(joystick), SDL_JoystickNumHats(joystick),
SDL_JoystickNumBalls(joystick), SDL_JoystickNumButtons(joystick));
/* Initialize drawing rectangles */
memset(axis_area, 0, (sizeof axis_area));
draw = 0;
/* Loop, getting joystick events! */
done = 0;
while (!done) {
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_JOYAXISMOTION:
printf("Joystick %d axis %d value: %d\n",
event.jaxis.which,
event.jaxis.axis, event.jaxis.value);
break;
case SDL_JOYHATMOTION:
printf("Joystick %d hat %d value:",
event.jhat.which, event.jhat.hat);
if (event.jhat.value == SDL_HAT_CENTERED)
printf(" centered");
if (event.jhat.value & SDL_HAT_UP)
printf(" up");
if (event.jhat.value & SDL_HAT_RIGHT)
printf(" right");
if (event.jhat.value & SDL_HAT_DOWN)
printf(" down");
if (event.jhat.value & SDL_HAT_LEFT)
printf(" left");
printf("\n");
break;
case SDL_JOYBALLMOTION:
printf("Joystick %d ball %d delta: (%d,%d)\n",
event.jball.which,
event.jball.ball, event.jball.xrel, event.jball.yrel);
break;
case SDL_JOYBUTTONDOWN:
printf("Joystick %d button %d down\n",
event.jbutton.which, event.jbutton.button);
break;
case SDL_JOYBUTTONUP:
printf("Joystick %d button %d up\n",
event.jbutton.which, event.jbutton.button);
break;
case SDL_KEYDOWN:
if (event.key.keysym.sym != SDLK_ESCAPE) {
break;
}
/* Fall through to signal quit */
case SDL_QUIT:
done = 1;
break;
default:
break;
}
}
/* Update visual joystick state */
for (i = 0; i < SDL_JoystickNumButtons(joystick); ++i) {
SDL_Rect area;
area.x = i * 34;
area.y = SCREEN_HEIGHT - 34;
area.w = 32;
area.h = 32;
if (SDL_JoystickGetButton(joystick, i) == SDL_PRESSED) {
SDL_FillRect(screen, &area, 0xFFFF);
} else {
SDL_FillRect(screen, &area, 0x0000);
}
SDL_UpdateRects(screen, 1, &area);
}
for (i = 0;
i < SDL_JoystickNumAxes(joystick) / 2
&& i < SDL_arraysize(axis_area); ++i) {
/* Erase previous axes */
SDL_FillRect(screen, &axis_area[i][draw], 0x0000);
/* Draw the X/Y axis */
draw = !draw;
x = (((int) SDL_JoystickGetAxis(joystick, i * 2 + 0)) + 32768);
x *= SCREEN_WIDTH;
x /= 65535;
if (x < 0) {
x = 0;
} else if (x > (SCREEN_WIDTH - 16)) {
x = SCREEN_WIDTH - 16;
}
y = (((int) SDL_JoystickGetAxis(joystick, i * 2 + 1)) + 32768);
y *= SCREEN_HEIGHT;
y /= 65535;
if (y < 0) {
y = 0;
} else if (y > (SCREEN_HEIGHT - 16)) {
y = SCREEN_HEIGHT - 16;
}
149
150
151
152
153
154
155
156
157
axis_area[i][draw].x = (Sint16) x;
axis_area[i][draw].y = (Sint16) y;
axis_area[i][draw].w = 16;
axis_area[i][draw].h = 16;
SDL_FillRect(screen, &axis_area[i][draw], 0xFFFF);
SDL_UpdateRects(screen, 2, axis_area[i]);
}
}
158
159
}
160
161
int
main(int argc, char *argv[])
162
{
163
164
165
166
167
168
169
170
171
172
173
174
175
176
const char *name;
int i;
SDL_Joystick *joystick;
/* Initialize SDL (Note: video is required to start event loop) */
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
exit(1);
}
/* Print information about the joysticks */
printf("There are %d joysticks attached\n", SDL_NumJoysticks());
for (i = 0; i < SDL_NumJoysticks(); ++i) {
name = SDL_JoystickName(i);
177
printf("Joystick %d: %s\n", i, name ? name : "Unknown Joystick");
178
179
joystick = SDL_JoystickOpen(i);
if (joystick == NULL) {
180
181
fprintf(stderr, "SDL_JoystickOpen(%d) failed: %s\n", i,
SDL_GetError());
182
183
184
185
186
187
188
} else {
printf(" axes: %d\n", SDL_JoystickNumAxes(joystick));
printf(" balls: %d\n", SDL_JoystickNumBalls(joystick));
printf(" hats: %d\n", SDL_JoystickNumHats(joystick));
printf(" buttons: %d\n", SDL_JoystickNumButtons(joystick));
SDL_JoystickClose(joystick);
}
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
}
if (argv[1]) {
joystick = SDL_JoystickOpen(atoi(argv[1]));
if (joystick == NULL) {
printf("Couldn't open joystick %d: %s\n", atoi(argv[1]),
SDL_GetError());
} else {
WatchJoystick(joystick);
SDL_JoystickClose(joystick);
}
}
SDL_QuitSubSystem(SDL_INIT_VIDEO | SDL_INIT_JOYSTICK);
return (0);
204
}